arch/mips/kernel/setup.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 1995 Linus Torvalds
   7  * Copyright (C) 1995 Waldorf Electronics
   8  * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03  Ralf Baechle
   9  * Copyright (C) 1996 Stoned Elipot
  10  * Copyright (C) 1999 Silicon Graphics, Inc.
  11  * Copyright (C) 2000, 2001, 2002, 2007  Maciej W. Rozycki
  12  */
  13 #include <linux/init.h>
  14 #include <linux/ioport.h>
  15 #include <linux/export.h>
  16 #include <linux/screen_info.h>
  17 #include <linux/memblock.h>
  18 #include <linux/initrd.h>
  19 #include <linux/root_dev.h>
  20 #include <linux/highmem.h>
  21 #include <linux/console.h>
  22 #include <linux/pfn.h>
  23 #include <linux/debugfs.h>
  24 #include <linux/kexec.h>
  25 #include <linux/sizes.h>
  26 #include <linux/device.h>
  27 #include <linux/dma-map-ops.h>
  28 #include <linux/decompress/generic.h>
  29 #include <linux/of_fdt.h>
  30 #include <linux/of_reserved_mem.h>
  31 #include <linux/dmi.h>
  32
  33 #include <asm/addrspace.h>
  34 #include <asm/bootinfo.h>
  35 #include <asm/bugs.h>
  36 #include <asm/cache.h>
  37 #include <asm/cdmm.h>
  38 #include <asm/cpu.h>
  39 #include <asm/debug.h>
  40 #include <asm/dma-coherence.h>
  41 #include <asm/sections.h>
  42 #include <asm/setup.h>
  43 #include <asm/smp-ops.h>
  44 #include <asm/prom.h>
  45
  46 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB
  47 const char __section(".appended_dtb") __appended_dtb[0x100000];
  48 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
  49
  50 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
  51
  52 EXPORT_SYMBOL(cpu_data);
  53
  54 #ifdef CONFIG_VT
  55 struct screen_info screen_info;
  56 #endif
  57
  58 /*
  59  * Setup information
  60  *
  61  * These are initialized so they are in the .data section
  62  */
  63 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
  64
  65 EXPORT_SYMBOL(mips_machtype);
  66
  67 static char __initdata command_line[COMMAND_LINE_SIZE];
  68 char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
  69
  70 #ifdef CONFIG_CMDLINE_BOOL
  71 static const char builtin_cmdline[] __initconst = CONFIG_CMDLINE;
  72 #else
  73 static const char builtin_cmdline[] __initconst = "";
  74 #endif
  75
  76 /*
  77  * mips_io_port_base is the begin of the address space to which x86 style
  78  * I/O ports are mapped.
  79  */
  80 unsigned long mips_io_port_base = -1;
  81 EXPORT_SYMBOL(mips_io_port_base);
  82
  83 static struct resource code_resource = { .name = "Kernel code", };
  84 static struct resource data_resource = { .name = "Kernel data", };
  85 static struct resource bss_resource = { .name = "Kernel bss", };
  86
  87 static void *detect_magic __initdata = detect_memory_region;
  88
  89 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
  90 unsigned long ARCH_PFN_OFFSET;
  91 EXPORT_SYMBOL(ARCH_PFN_OFFSET);
  92 #endif
  93
  94 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
  95 {
  96         void *dm = &detect_magic;
  97         phys_addr_t size;
  98
  99         for (size = sz_min; size < sz_max; size <<= 1) {
 100                 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
 101                         break;
 102         }
 103
 104         pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
 105                 ((unsigned long long) size) / SZ_1M,
 106                 (unsigned long long) start,
 107                 ((unsigned long long) sz_min) / SZ_1M,
 108                 ((unsigned long long) sz_max) / SZ_1M);
 109
 110         memblock_add(start, size);
 111 }
 112
 113 /*
 114  * Manage initrd
 115  */
 116 #ifdef CONFIG_BLK_DEV_INITRD
 117
 118 static int __init rd_start_early(char *p)
 119 {
 120         unsigned long start = memparse(p, &p);
 121
 122 #ifdef CONFIG_64BIT
 123         /* Guess if the sign extension was forgotten by bootloader */
 124         if (start < XKPHYS)
 125                 start = (int)start;
 126 #endif
 127         initrd_start = start;
 128         initrd_end += start;
 129         return 0;
 130 }
 131 early_param("rd_start", rd_start_early);
 132
 133 static int __init rd_size_early(char *p)
 134 {
 135         initrd_end += memparse(p, &p);
 136         return 0;
 137 }
 138 early_param("rd_size", rd_size_early);
 139
 140 /* it returns the next free pfn after initrd */
 141 static unsigned long __init init_initrd(void)
 142 {
 143         unsigned long end;
 144
 145         /*
 146          * Board specific code or command line parser should have
 147          * already set up initrd_start and initrd_end. In these cases
 148          * perfom sanity checks and use them if all looks good.
 149          */
 150         if (!initrd_start || initrd_end <= initrd_start)
 151                 goto disable;
 152
 153         if (initrd_start & ~PAGE_MASK) {
 154                 pr_err("initrd start must be page aligned\n");
 155                 goto disable;
 156         }
 157         if (initrd_start < PAGE_OFFSET) {
 158                 pr_err("initrd start < PAGE_OFFSET\n");
 159                 goto disable;
 160         }
 161
 162         /*
 163          * Sanitize initrd addresses. For example firmware
 164          * can't guess if they need to pass them through
 165          * 64-bits values if the kernel has been built in pure
 166          * 32-bit. We need also to switch from KSEG0 to XKPHYS
 167          * addresses now, so the code can now safely use __pa().
 168          */
 169         end = __pa(initrd_end);
 170         initrd_end = (unsigned long)__va(end);
 171         initrd_start = (unsigned long)__va(__pa(initrd_start));
 172
 173         ROOT_DEV = Root_RAM0;
 174         return PFN_UP(end);
 175 disable:
 176         initrd_start = 0;
 177         initrd_end = 0;
 178         return 0;
 179 }
 180
 181 /* In some conditions (e.g. big endian bootloader with a little endian
 182    kernel), the initrd might appear byte swapped.  Try to detect this and
 183    byte swap it if needed.  */
 184 static void __init maybe_bswap_initrd(void)
 185 {
 186 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
 187         u64 buf;
 188
 189         /* Check for CPIO signature */
 190         if (!memcmp((void *)initrd_start, "070701", 6))
 191                 return;
 192
 193         /* Check for compressed initrd */
 194         if (decompress_method((unsigned char *)initrd_start, 8, NULL))
 195                 return;
 196
 197         /* Try again with a byte swapped header */
 198         buf = swab64p((u64 *)initrd_start);
 199         if (!memcmp(&buf, "070701", 6) ||
 200             decompress_method((unsigned char *)(&buf), 8, NULL)) {
 201                 unsigned long i;
 202
 203                 pr_info("Byteswapped initrd detected\n");
 204                 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
 205                         swab64s((u64 *)i);
 206         }
 207 #endif
 208 }
 209
 210 static void __init finalize_initrd(void)
 211 {
 212         unsigned long size = initrd_end - initrd_start;
 213
 214         if (size == 0) {
 215                 printk(KERN_INFO "Initrd not found or empty");
 216                 goto disable;
 217         }
 218         if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
 219                 printk(KERN_ERR "Initrd extends beyond end of memory");
 220                 goto disable;
 221         }
 222
 223         maybe_bswap_initrd();
 224
 225         memblock_reserve(__pa(initrd_start), size);
 226         initrd_below_start_ok = 1;
 227
 228         pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
 229                 initrd_start, size);
 230         return;
 231 disable:
 232         printk(KERN_CONT " - disabling initrd\n");
 233         initrd_start = 0;
 234         initrd_end = 0;
 235 }
 236
 237 #else  /* !CONFIG_BLK_DEV_INITRD */
 238
 239 static unsigned long __init init_initrd(void)
 240 {
 241         return 0;
 242 }
 243
 244 #define finalize_initrd()       do {} while (0)
 245
 246 #endif
 247
 248 /*
 249  * Initialize the bootmem allocator. It also setup initrd related data
 250  * if needed.
 251  */
 252 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON64) && defined(CONFIG_NUMA))
 253
 254 static void __init bootmem_init(void)
 255 {
 256         init_initrd();
 257         finalize_initrd();
 258 }
 259
 260 #else  /* !CONFIG_SGI_IP27 */
 261
 262 static void __init bootmem_init(void)
 263 {
 264         phys_addr_t ramstart, ramend;
 265         unsigned long start, end;
 266         int i;
 267
 268         ramstart = memblock_start_of_DRAM();
 269         ramend = memblock_end_of_DRAM();
 270
 271         /*
 272          * Sanity check any INITRD first. We don't take it into account
 273          * for bootmem setup initially, rely on the end-of-kernel-code
 274          * as our memory range starting point. Once bootmem is inited we
 275          * will reserve the area used for the initrd.
 276          */
 277         init_initrd();
 278
 279         /* Reserve memory occupied by kernel. */
 280         memblock_reserve(__pa_symbol(&_text),
 281                         __pa_symbol(&_end) - __pa_symbol(&_text));
 282
 283         /* max_low_pfn is not a number of pages but the end pfn of low mem */
 284
 285 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
 286         ARCH_PFN_OFFSET = PFN_UP(ramstart);
 287 #else
 288         /*
 289          * Reserve any memory between the start of RAM and PHYS_OFFSET
 290          */
 291         if (ramstart > PHYS_OFFSET)
 292                 memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET);
 293
 294         if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) {
 295                 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
 296                         (unsigned long)((PFN_UP(ramstart) - ARCH_PFN_OFFSET) * sizeof(struct page)),
 297                         (unsigned long)(PFN_UP(ramstart) - ARCH_PFN_OFFSET));
 298         }
 299 #endif
 300
 301         min_low_pfn = ARCH_PFN_OFFSET;
 302         max_pfn = PFN_DOWN(ramend);
 303         for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, NULL) {
 304                 /*
 305                  * Skip highmem here so we get an accurate max_low_pfn if low
 306                  * memory stops short of high memory.
 307                  * If the region overlaps HIGHMEM_START, end is clipped so
 308                  * max_pfn excludes the highmem portion.
 309                  */
 310                 if (start >= PFN_DOWN(HIGHMEM_START))
 311                         continue;
 312                 if (end > PFN_DOWN(HIGHMEM_START))
 313                         end = PFN_DOWN(HIGHMEM_START);
 314                 if (end > max_low_pfn)
 315                         max_low_pfn = end;
 316         }
 317
 318         if (min_low_pfn >= max_low_pfn)
 319                 panic("Incorrect memory mapping !!!");
 320
 321         if (max_pfn > PFN_DOWN(HIGHMEM_START)) {
 322 #ifdef CONFIG_HIGHMEM
 323                 highstart_pfn = PFN_DOWN(HIGHMEM_START);
 324                 highend_pfn = max_pfn;
 325 #else
 326                 max_low_pfn = PFN_DOWN(HIGHMEM_START);
 327                 max_pfn = max_low_pfn;
 328 #endif
 329         }
 330
 331         /*
 332          * Reserve initrd memory if needed.
 333          */
 334         finalize_initrd();
 335 }
 336
 337 #endif  /* CONFIG_SGI_IP27 */
 338
 339 static int usermem __initdata;
 340
 341 static int __init early_parse_mem(char *p)
 342 {
 343         phys_addr_t start, size;
 344
 345         /*
 346          * If a user specifies memory size, we
 347          * blow away any automatically generated
 348          * size.
 349          */
 350         if (usermem == 0) {
 351                 usermem = 1;
 352                 memblock_remove(memblock_start_of_DRAM(),
 353                         memblock_end_of_DRAM() - memblock_start_of_DRAM());
 354         }
 355         start = 0;
 356         size = memparse(p, &p);
 357         if (*p == '@')
 358                 start = memparse(p + 1, &p);
 359
 360         memblock_add(start, size);
 361
 362         return 0;
 363 }
 364 early_param("mem", early_parse_mem);
 365
 366 static int __init early_parse_memmap(char *p)
 367 {
 368         char *oldp;
 369         u64 start_at, mem_size;
 370
 371         if (!p)
 372                 return -EINVAL;
 373
 374         if (!strncmp(p, "exactmap", 8)) {
 375                 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
 376                 return 0;
 377         }
 378
 379         oldp = p;
 380         mem_size = memparse(p, &p);
 381         if (p == oldp)
 382                 return -EINVAL;
 383
 384         if (*p == '@') {
 385                 start_at = memparse(p+1, &p);
 386                 memblock_add(start_at, mem_size);
 387         } else if (*p == '#') {
 388                 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
 389                 return -EINVAL;
 390         } else if (*p == '$') {
 391                 start_at = memparse(p+1, &p);
 392                 memblock_add(start_at, mem_size);
 393                 memblock_reserve(start_at, mem_size);
 394         } else {
 395                 pr_err("\"memmap\" invalid format!\n");
 396                 return -EINVAL;
 397         }
 398
 399         if (*p == '\0') {
 400                 usermem = 1;
 401                 return 0;
 402         } else
 403                 return -EINVAL;
 404 }
 405 early_param("memmap", early_parse_memmap);
 406
 407 #ifdef CONFIG_PROC_VMCORE
 408 static unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
 409 static int __init early_parse_elfcorehdr(char *p)
 410 {
 411         phys_addr_t start, end;
 412         u64 i;
 413
 414         setup_elfcorehdr = memparse(p, &p);
 415
 416         for_each_mem_range(i, &start, &end) {
 417                 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
 418                         /*
 419                          * Reserve from the elf core header to the end of
 420                          * the memory segment, that should all be kdump
 421                          * reserved memory.
 422                          */
 423                         setup_elfcorehdr_size = end - setup_elfcorehdr;
 424                         break;
 425                 }
 426         }
 427         /*
 428          * If we don't find it in the memory map, then we shouldn't
 429          * have to worry about it, as the new kernel won't use it.
 430          */
 431         return 0;
 432 }
 433 early_param("elfcorehdr", early_parse_elfcorehdr);
 434 #endif
 435
 436 #ifdef CONFIG_KEXEC
 437
 438 /* 64M alignment for crash kernel regions */
 439 #define CRASH_ALIGN     SZ_64M
 440 #define CRASH_ADDR_MAX  SZ_512M
 441
 442 static void __init mips_parse_crashkernel(void)
 443 {
 444         unsigned long long total_mem;
 445         unsigned long long crash_size, crash_base;
 446         int ret;
 447
 448         total_mem = memblock_phys_mem_size();
 449         ret = parse_crashkernel(boot_command_line, total_mem,
 450                                 &crash_size, &crash_base);
 451         if (ret != 0 || crash_size <= 0)
 452                 return;
 453
 454         if (crash_base <= 0) {
 455                 crash_base = memblock_find_in_range(CRASH_ALIGN, CRASH_ADDR_MAX,
 456                                                         crash_size, CRASH_ALIGN);
 457                 if (!crash_base) {
 458                         pr_warn("crashkernel reservation failed - No suitable area found.\n");
 459                         return;
 460                 }
 461         } else {
 462                 unsigned long long start;
 463
 464                 start = memblock_find_in_range(crash_base, crash_base + crash_size,
 465                                                 crash_size, 1);
 466                 if (start != crash_base) {
 467                         pr_warn("Invalid memory region reserved for crash kernel\n");
 468                         return;
 469                 }
 470         }
 471
 472         crashk_res.start = crash_base;
 473         crashk_res.end   = crash_base + crash_size - 1;
 474 }
 475
 476 static void __init request_crashkernel(struct resource *res)
 477 {
 478         int ret;
 479
 480         if (crashk_res.start == crashk_res.end)
 481                 return;
 482
 483         ret = request_resource(res, &crashk_res);
 484         if (!ret)
 485                 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
 486                         (unsigned long)(resource_size(&crashk_res) >> 20),
 487                         (unsigned long)(crashk_res.start  >> 20));
 488 }
 489 #else /* !defined(CONFIG_KEXEC)         */
 490 static void __init mips_parse_crashkernel(void)
 491 {
 492 }
 493
 494 static void __init request_crashkernel(struct resource *res)
 495 {
 496 }
 497 #endif /* !defined(CONFIG_KEXEC)  */
 498
 499 static void __init check_kernel_sections_mem(void)
 500 {
 501         phys_addr_t start = __pa_symbol(&_text);
 502         phys_addr_t size = __pa_symbol(&_end) - start;
 503
 504         if (!memblock_is_region_memory(start, size)) {
 505                 pr_info("Kernel sections are not in the memory maps\n");
 506                 memblock_add(start, size);
 507         }
 508 }
 509
 510 static void __init bootcmdline_append(const char *s, size_t max)
 511 {
 512         if (!s[0] || !max)
 513                 return;
 514
 515         if (boot_command_line[0])
 516                 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 517
 518         strlcat(boot_command_line, s, max);
 519 }
 520
 521 #ifdef CONFIG_OF_EARLY_FLATTREE
 522
 523 static int __init bootcmdline_scan_chosen(unsigned long node, const char *uname,
 524                                           int depth, void *data)
 525 {
 526         bool *dt_bootargs = data;
 527         const char *p;
 528         int l;
 529
 530         if (depth != 1 || !data ||
 531             (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
 532                 return 0;
 533
 534         p = of_get_flat_dt_prop(node, "bootargs", &l);
 535         if (p != NULL && l > 0) {
 536                 bootcmdline_append(p, min(l, COMMAND_LINE_SIZE));
 537                 *dt_bootargs = true;
 538         }
 539
 540         return 1;
 541 }
 542
 543 #endif /* CONFIG_OF_EARLY_FLATTREE */
 544
 545 static void __init bootcmdline_init(void)
 546 {
 547         bool dt_bootargs = false;
 548
 549         /*
 550          * If CMDLINE_OVERRIDE is enabled then initializing the command line is
 551          * trivial - we simply use the built-in command line unconditionally &
 552          * unmodified.
 553          */
 554         if (IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) {
 555                 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 556                 return;
 557         }
 558
 559         /*
 560          * If the user specified a built-in command line &
 561          * MIPS_CMDLINE_BUILTIN_EXTEND, then the built-in command line is
 562          * prepended to arguments from the bootloader or DT so we'll copy them
 563          * to the start of boot_command_line here. Otherwise, empty
 564          * boot_command_line to undo anything early_init_dt_scan_chosen() did.
 565          */
 566         if (IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
 567                 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 568         else
 569                 boot_command_line[0] = 0;
 570
 571 #ifdef CONFIG_OF_EARLY_FLATTREE
 572         /*
 573          * If we're configured to take boot arguments from DT, look for those
 574          * now.
 575          */
 576         if (IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB) ||
 577             IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND))
 578                 of_scan_flat_dt(bootcmdline_scan_chosen, &dt_bootargs);
 579 #endif
 580
 581         /*
 582          * If we didn't get any arguments from DT (regardless of whether that's
 583          * because we weren't configured to look for them, or because we looked
 584          * & found none) then we'll take arguments from the bootloader.
 585          * plat_mem_setup() should have filled arcs_cmdline with arguments from
 586          * the bootloader.
 587          */
 588         if (IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) || !dt_bootargs)
 589                 bootcmdline_append(arcs_cmdline, COMMAND_LINE_SIZE);
 590
 591         /*
 592          * If the user specified a built-in command line & we didn't already
 593          * prepend it, we append it to boot_command_line here.
 594          */
 595         if (IS_ENABLED(CONFIG_CMDLINE_BOOL) &&
 596             !IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
 597                 bootcmdline_append(builtin_cmdline, COMMAND_LINE_SIZE);
 598 }
 599
 600 /*
 601  * arch_mem_init - initialize memory management subsystem
 602  *
 603  *  o plat_mem_setup() detects the memory configuration and will record detected
 604  *    memory areas using memblock_add.
 605  *
 606  * At this stage the memory configuration of the system is known to the
 607  * kernel but generic memory management system is still entirely uninitialized.
 608  *
 609  *  o bootmem_init()
 610  *  o sparse_init()
 611  *  o paging_init()
 612  *  o dma_contiguous_reserve()
 613  *
 614  * At this stage the bootmem allocator is ready to use.
 615  *
 616  * NOTE: historically plat_mem_setup did the entire platform initialization.
 617  *       This was rather impractical because it meant plat_mem_setup had to
 618  * get away without any kind of memory allocator.  To keep old code from
 619  * breaking plat_setup was just renamed to plat_mem_setup and a second platform
 620  * initialization hook for anything else was introduced.
 621  */
 622 static void __init arch_mem_init(char **cmdline_p)
 623 {
 624         /* call board setup routine */
 625         plat_mem_setup();
 626         memblock_set_bottom_up(true);
 627
 628         bootcmdline_init();
 629         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 630         *cmdline_p = command_line;
 631
 632         parse_early_param();
 633
 634         if (usermem)
 635                 pr_info("User-defined physical RAM map overwrite\n");
 636
 637         check_kernel_sections_mem();
 638
 639         early_init_fdt_reserve_self();
 640         early_init_fdt_scan_reserved_mem();
 641
 642 #ifndef CONFIG_NUMA
 643         memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
 644 #endif
 645         bootmem_init();
 646
 647         /*
 648          * Prevent memblock from allocating high memory.
 649          * This cannot be done before max_low_pfn is detected, so up
 650          * to this point is possible to only reserve physical memory
 651          * with memblock_reserve; memblock_alloc* can be used
 652          * only after this point
 653          */
 654         memblock_set_current_limit(PFN_PHYS(max_low_pfn));
 655
 656 #ifdef CONFIG_PROC_VMCORE
 657         if (setup_elfcorehdr && setup_elfcorehdr_size) {
 658                 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
 659                        setup_elfcorehdr, setup_elfcorehdr_size);
 660                 memblock_reserve(setup_elfcorehdr, setup_elfcorehdr_size);
 661         }
 662 #endif
 663
 664         mips_parse_crashkernel();
 665 #ifdef CONFIG_KEXEC
 666         if (crashk_res.start != crashk_res.end)
 667                 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
 668 #endif
 669         device_tree_init();
 670
 671         /*
 672          * In order to reduce the possibility of kernel panic when failed to
 673          * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate
 674          * low memory as small as possible before plat_swiotlb_setup(), so
 675          * make sparse_init() using top-down allocation.
 676          */
 677         memblock_set_bottom_up(false);
 678         sparse_init();
 679         memblock_set_bottom_up(true);
 680
 681         plat_swiotlb_setup();
 682
 683         dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
 684
 685         /* Reserve for hibernation. */
 686         memblock_reserve(__pa_symbol(&__nosave_begin),
 687                 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin));
 688
 689         fdt_init_reserved_mem();
 690
 691         early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
 692 }
 693
 694 static void __init resource_init(void)
 695 {
 696         phys_addr_t start, end;
 697         u64 i;
 698
 699         if (UNCAC_BASE != IO_BASE)
 700                 return;
 701
 702         code_resource.start = __pa_symbol(&_text);
 703         code_resource.end = __pa_symbol(&_etext) - 1;
 704         data_resource.start = __pa_symbol(&_etext);
 705         data_resource.end = __pa_symbol(&_edata) - 1;
 706         bss_resource.start = __pa_symbol(&__bss_start);
 707         bss_resource.end = __pa_symbol(&__bss_stop) - 1;
 708
 709         for_each_mem_range(i, &start, &end) {
 710                 struct resource *res;
 711
 712                 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
 713                 if (!res)
 714                         panic("%s: Failed to allocate %zu bytes\n", __func__,
 715                               sizeof(struct resource));
 716
 717                 res->start = start;
 718                 /*
 719                  * In memblock, end points to the first byte after the
 720                  * range while in resourses, end points to the last byte in
 721                  * the range.
 722                  */
 723                 res->end = end - 1;
 724                 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
 725                 res->name = "System RAM";
 726
 727                 request_resource(&iomem_resource, res);
 728
 729                 /*
 730                  *  We don't know which RAM region contains kernel data,
 731                  *  so we try it repeatedly and let the resource manager
 732                  *  test it.
 733                  */
 734                 request_resource(res, &code_resource);
 735                 request_resource(res, &data_resource);
 736                 request_resource(res, &bss_resource);
 737                 request_crashkernel(res);
 738         }
 739 }
 740
 741 #ifdef CONFIG_SMP
 742 static void __init prefill_possible_map(void)
 743 {
 744         int i, possible = num_possible_cpus();
 745
 746         if (possible > nr_cpu_ids)
 747                 possible = nr_cpu_ids;
 748
 749         for (i = 0; i < possible; i++)
 750                 set_cpu_possible(i, true);
 751         for (; i < NR_CPUS; i++)
 752                 set_cpu_possible(i, false);
 753
 754         nr_cpu_ids = possible;
 755 }
 756 #else
 757 static inline void prefill_possible_map(void) {}
 758 #endif
 759
 760 void __init setup_arch(char **cmdline_p)
 761 {
 762         cpu_probe();
 763         mips_cm_probe();
 764         prom_init();
 765
 766         setup_early_fdc_console();
 767 #ifdef CONFIG_EARLY_PRINTK
 768         setup_early_printk();
 769 #endif
 770         cpu_report();
 771         check_bugs_early();
 772
 773 #if defined(CONFIG_VT)
 774 #if defined(CONFIG_VGA_CONSOLE)
 775         conswitchp = &vga_con;
 776 #endif
 777 #endif
 778
 779         arch_mem_init(cmdline_p);
 780         dmi_setup();
 781
 782         resource_init();
 783         plat_smp_setup();
 784         prefill_possible_map();
 785
 786         cpu_cache_init();
 787         paging_init();
 788
 789         memblock_dump_all();
 790 }
 791
 792 unsigned long kernelsp[NR_CPUS];
 793 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
 794
 795 #ifdef CONFIG_USE_OF
 796 unsigned long fw_passed_dtb;
 797 #endif
 798
 799 #ifdef CONFIG_DEBUG_FS
 800 struct dentry *mips_debugfs_dir;
 801 static int __init debugfs_mips(void)
 802 {
 803         mips_debugfs_dir = debugfs_create_dir("mips", NULL);
 804         return 0;
 805 }
 806 arch_initcall(debugfs_mips);
 807 #endif
 808
 809 #ifdef CONFIG_DMA_MAYBE_COHERENT
 810 /* User defined DMA coherency from command line. */
 811 enum coherent_io_user_state coherentio = IO_COHERENCE_DEFAULT;
 812 EXPORT_SYMBOL_GPL(coherentio);
 813 int hw_coherentio;      /* Actual hardware supported DMA coherency setting. */
 814
 815 static int __init setcoherentio(char *str)
 816 {
 817         coherentio = IO_COHERENCE_ENABLED;
 818         pr_info("Hardware DMA cache coherency (command line)\n");
 819         return 0;
 820 }
 821 early_param("coherentio", setcoherentio);
 822
 823 static int __init setnocoherentio(char *str)
 824 {
 825         coherentio = IO_COHERENCE_DISABLED;
 826         pr_info("Software DMA cache coherency (command line)\n");
 827         return 0;
 828 }
 829 early_param("nocoherentio", setnocoherentio);
 830 #endif